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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Just use
clearRect(you don't need to set the color then since it used the background color).However in an ideal world you might use the Layout library (http://www.espruino.com/Bangle.js+Layout) which would handle the positioning (and erasing of the background) for you - so then it'd all be in the right position on Bangle.js 1 too